18"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 19.75"w x 25.75"h] 12in diameter ventilation 4 X 12 Is CRFG2028 Width_14in

ventilation

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 22" OR 22" x 20" duct opening (measured at the opening)

+ Product Details Size - 16"w X 30"h X 2"d (for duct opening measurement only)

High Quality – Rigid aluminum construction with counter-sunk screw holes (screws included) and no sharp edges

actual front end outer dimensions are approximately 30 5/8" width X 30 5/8" height

18"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh Black [Outer Dimensions 19.75"w x 25.75"h] 12in diameter ventilation 4 X 12 Is CRFG2028 Width_14in ventilation + Product Details Perfect Fit & Easy Sizing Designed for a 20" x 22" OR 22" x 20" duct opening (measured at the opening)